crypto(3) OpenSSL crypto(3)
NAME
crypto - OpenSSL cryptographic library
SYNOPSISDESCRIPTION
The OpenSSL crypto library implements a wide range of cryptographic
algorithms used in various Internet standards. The services provided by
this library are used by the OpenSSL implementations of SSL, TLS and
S/MIME, and they have also been used to implement SSH, OpenPGP, and
other cryptographic standards.
OVERVIEWlibcrypto consists of a number of sub-libraries that implement the
individual algorithms.
The functionality includes symmetric encryption, public key cryptogra-
phy and key agreement, certificate handling, cryptographic hash func-
tions and a cryptographic pseudo-random number generator.
SYMMETRIC CIPHERS
blowfish(3), cast(3), des(3), idea(3), rc2(3), rc4(3), rc5(3)
PUBLIC KEY CRYPTOGRAPHY AND KEY AGREEMENT
dsa(3), dh(3), rsa(3)
CERTIFICATES
x509(3), x509v3(3)
AUTHENTICATION CODES, HASH FUNCTIONS
hmac(3), md2(3), md4(3), md5(3), mdc2(3), ripemd(3), sha(3)
AUXILIARY FUNCTIONS
err(3), threads(3), rand(3), OPENSSL_VERSION_NUMBER(3)
INPUT/OUTPUT, DATA ENCODING
asn1(3), bio(3), evp(3), pem(3), pkcs7(3), pkcs12(3)
INTERNAL FUNCTIONS
bn(3), buffer(3), lhash(3), objects(3), stack(3), txt_db(3)
NOTES
Some of the newer functions follow a naming convention using the num-
bers 0 and 1. For example the functions:
int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev);
int X509_add1_trust_object(X509 *x, ASN1_OBJECT *obj);
The 0 version uses the supplied structure pointer directly in the par-
ent and it will be freed up when the parent is freed. In the above
example crl would be freed but rev would not.
The 1 function uses a copy of the supplied structure pointer (or in
some cases increases its link count) in the parent and so both (x and
obj above) should be freed up.
SEEALSOopenssl(1), ssl(3)
0.9.7d 2005-02-24 crypto(3)